This section is from the "The Herb Hunters Guide" book, by A. F. Sievers. Also available from Amazon: Herb Hunters Guide.

Figure 67.Horse nettle (Solanum carolinense)
Sand brier, bull nettle, radical-weed, tread-softly, apple of Sodom.
The horse nettle is found in dry, sandy soil from Ontario to Illinois and Massachusetts, Florida, and Texas.
This plant is easily recognized in late summer and fall by its round, smooth, orange-yellow berries about one-half to three-fourths of an inch in diameter which are borne in small drooping clusters. It is an herb 1 to 4 feet high with an erect, branched stem and covered with fine hair. The branches, also the petioles and midveins of the leaves, are armed with straight yellow prickles. The leaves are 2 to 6 inches long with rather deep triangular lobes. From May to September the plant produces violet or white flowers about 1 to 1 1/4 inches broad.
The ripe berries, carefully dried.
 
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